Somewhere in this time frame is generally when the sex of a plant can be determined. The pre-flowers develop here, though they can be quite small, and once sex is determined it is time to separate the males from the females before any fertilization can take place.
This is assuming the grower is using a germination technique that doesn’t involve direct planting, otherwise, they simply need to wait for the plant to sprout to begin the seedling phase.
Chapter 3: Vegetative
The rest of the growth is up to the plant, but when it seems to be getting close to harvest time flushing nutrients is important for quality tasting harvest. Simply flush the plants with pH-balanced water and stop administering nutrients at this time to ensure a good harvest.
Flowering is triggered by the light cycle shifting to 12 hours on and off, so the timing of it will vary from growing to grow but this generally begins around week 13 of a grow.
Buds will not have grown too much at this point, so don’t worry if they are still fairly small.
You can see the extreme stress the Pyrethrum combined with grow lights has put on the young plant.
The cotyledon leaves unfurl and start gaining height above the soil. You can see the first “true” (wrinkled) set of marijuana leaves nestled in between the cotyledons at first, and as time goes on these spread out to catch as much light as possible.
Recovery of Topped Marijuana Plant & Formation of 2 New Colas
Bonus Marijuana Time Lapse Videos
Why do marijuana plants seem to “breathe” in time-lapse photography? Why do the leaves begin to droop down and then suddenly spring back up?
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